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प्रश्न
What is the special feature present in a human heart which does not allow the mixing of blood when oxygen-rich and carbon dioxide-rich blood reaches the heart?
उत्तर
The human heart is four-chambered consisting of two atria and two ventricles. The left side of the heart receives oxygen-rich blood whereas the right side of the heart receives carbon dioxide-rich blood. The left and right sides of the heart are completely separated from each other by a muscular septum, which prevents the mixing of oxygen-rich and carbon-dioxide-rich blood.
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संबंधित प्रश्न
What makes the blood look red?
The liquid connective tissue A circulates in our body continuously without stopping. This tissue contains a pigment B which imparts it a colour C. The tissue A consists of four components D, E, F and G. The component D fights infection and protects us from diseases. The component E helps in the clotting of tissue A if a person gets a cut. The component F is a liquid which consists mainly of water with many substances dissolved in it and component G carries oxygen from the lungs to all the parts of the body.
(a) What is (i) tissue A (ii) pigment B, and (iii) colour C?
(b) Name (i) D (ii) E (iii) F, and (iv) G.
(c) Name one substance (other than oxygen) which is transported by tissue A in the human body.
(d) Which two components of tissue A are the cells without nucleus?
(e) Name any two organisms ( animals) which do not have liquid like A in their body.
Match the following.
| 1. Leukaemia | (a) Thrombocytes |
| 2. Platelets | (b) Phagocyte |
| 3. Monocytes | (c) Decrease in leucocytes |
| 4. Leucopenia | (d) Blood Cancer |
| 5. AB blood group | (e) Allergic condition |
| 6. O blood group | (f) Inflammation |
| 7. Eosinophil | (g) Absence of antigen |
| 8. Neutrophils | (h) Absence of antibody |
All veins carry deoxygenated blood.
Why is the colour of the blood-red?
Who discovered the Rh factor? Why was it named so?
Mature RBC in mammals does not have cell organelles.
Direction: In each of the following questions a statement of assertion (A) is given and a corresponding statement of Reason (R) is given just below it. Mark the correct statement as.
Assertion: RBC plays an important role in the transport of respiratory gases.
Reason: RBC does not have cell organelles and a nucleus.
The volume of blood in human adults is ______.
Single circulation i.e. blood flows through the heart only once during one cycle of passage through the body, is exhibited by
